Motor-controlling system.



PATENTED APR. 21, 1908.

No. 885,5.16, A. nnoensnn & v. 0. STROBBL.

MOTOR CONTROLLING SYSTEM. APPLICATION nun JAN. 14, 1901.

' ("I'm I i g w 0 Mfl I ,Q Witnesses: W g I Inventors "VQ13'0W UNITEDSTATES PATENT OFFICE.

ARTHUR E. ,HOGBEBE AND VICTOR- O.

STROBEL, OF PHILADELPHIA, PENNSYLVANIA, ASSIGNORS TO N ILES-BEMEN'lT-PON D COMPANY, OF JERSEY CITY,

NEW JERSEY.

MOTOR-CONTROLLING SYSTEM.

Application filed January 14, R307.

Specification of Letters Patent.

Patented April 21, 1908. Serial No. 352,298. I

To all whom it may concern:

Be it known that we, ARTHUR E. Hosanna and Vroron O. STROBEL, citizens.of the United States, residing at Philadelphia, Philadelphia county,Pennsylvania, have invented certain new and useful Improvemehts inMotor-Controlling Systems, (Case A,) of which the following is aspecification.

, This invention relates to a controlling system for motors requiring.to be frequently started and stopped and reversed as, for instance,where a metal planer is operated by a reversing motorautomatically,controlled by the planer dogs to produce a slow cuttingtravel and fast backing travel for the table. In the present case wehave chosen to illustrate our invention as adapted for application to aplaner of otherwise ordinary construction. 1

' The invention win be readily understood from the following descriptiontaken in connection with the accompanying? drawing which is a diagramillustrating our system, the detailed parts being shown conventionall Inthe drawing :A, indicates one supply main: B, the-other supply main, themains .being assumed as having a usual main switch:

C, the motor field: D, the motor armature:

the shunt circuit through the field, constantly connected with the mainsand energizing the field: F, a first rheostat, always in theshunt fieldcircuit: G, a second rhcostat adapted for connection with the shuntfield circuit in parallel with the first rheostat: H, a short circuitacross the armature: I, a rheostat in this short circuit: J, a normallyoen switch in the armature short circuit:

an electromagnet in the armature short circuit: L, the armature lever ofmagnet- K, carrying the switch J, and tending, when moving in thedirection of attraction of magnet K, to close switch J: M, a secondelectroinagnet operating on the same armature lever and tending, whenenergized, to hold switch J open against the resistance of a springtending to close it, this second electroi'nagnet being in the mainarmature circuit: N, an auto-- matic regulating rheostat in the maincircuit of 'the armature: O, a solenoid in the main armature circuit: P,cuit: Q, a normally closed switch in this circuit, this switch beingopened by the action of solenoid 0:, It, a solenoid in this circuit tocooperate with rhcostat N: S, springs acting so adjusted as,

a shunt of the field ciron certain moving parts: '1, the main armaturecircuit: U, a whole, illustrated as a sliding structure: V, the usualreversing tumbler ot a planer, connected with the controller to shiftthecontroller from oneto the other of its two positions: W, a series thecontroller: X, contacts carried by erating with the fixed contacts whenthe motor is at high speed and the planer table making its backingstroke: and Y, a pair of movable contacts carried by the controller andcooperating with the fixed contacts when the motorv is at slow speed andthe planer tabie making its cutting stroke.

First rheostat F always in the field circuit is to be adjusted to givethe motor the proper high speedsuited for the fast backing stroke of theplanen Secondrheostat G, in'parallel with the first 'rhe'bst'at when theplaner is making its cutting stroke, is to be adjusted to give thearmature the slow speed suited to that stroke. Short circuit rheostat Iis to be when in closed circuit, to bring a suitable braking load uponthe armature. 1

In the drawing the tumbler is in the usual position in which it hasplaner table at the end of the cutting stroke in'bringing about thereversal of table motion and the armature is turning at its high aseries of four movable speed and in direction corresponding with backingmotion of the planer table, and the table is on its fast backing stroke.The rate of the backing speed may be adjusted at first rheostat F. Whenthe tumbler is reversed then the controllenin rewrsing the motion of thearmature, puts second rheostat G in parallel with the first rheostat inthe field circuit; and the slow speed for cutting may beadjusted bymeans ofthis second rheostat.

Thetwo rheostats F and G are adjusted by hand to suit the intendedworking conditions, that is to say, the intended cutting and backingspeeds of the planer table.

Taking the conditions as illustrated in the drawing the operation wouldbeas follows First: Field circuit'is' through first resistance F;armature short circuitis open'at switch J; this switch is held open bymagnet M energized by the main armature circuit; armature is running inbacking direction] at backing speed; planer table is making its of sixfixed contacts for.

the controller and coopbeen put the froni the positive main throughrheostat F during the reversal, and at reversal the field current isagain through firstresistance alone.

Fifth: Switch Q is to have been adjusted to the proper load limitationsof the motor; all regulatmg resistance will be in when the motor isstarting; it willbe quickly cut out by the action or solenoid R; (luringreduction of resistance the current may exceed the predetermined amountthen solenoid O o ens fast bacl-zin stroke and moving to the leftrelative to the tumbler.

The field circuit is l and the motor field to the negative ma n.- Themain armature circuit is from positive main A to contact pointtocontroller 3 segment X- -to controller segment to magnet M, to solenoidthrough variable resistance Nand itsrheostat arm, to the armature andfrom the armature to contact point W controller segment )3, thence torecontroller segment X and to negative main sistance N is immediatelycut in; switch Q B. The shunt circuit commencing at posicloses whenobstruction past; resistanceits backing stroke, moving magnet M isslightly energized and tends to turns in cutting direction at slowcutting tive contact YV goes through segment X, contact N switch Q whichis closed, solenoid R and to the negative main.

Second: The planer table nears the end of to the left; it engages thetumbler andshifts .it somewhat to the left; the four moving contacts Xof the controller leave the fixed contacts; all contacts of thecontroller are therefore momentarily open; the circuit through the fieldremains closed; all other circuits are open; the armature is turning bymomentum in backing direction in the energized field, magnet .\l isdcnergized',switch J is closed by its spring; short circuit ll is closedacross the armature; the armature now acts as a gen, erator; shortcircuit rheostat 1 brings a load upon the armature tending to slow itand stop it; the armature stops or slows down suiliciently for safereversal of current; the armature-stopping load in the short circuit isto have been suitably adjusted at short circuit rheosta't 1.

Third: Table has completed its backing stroke tumbler has moved 'clearto the left; controller is, moved to the left; contacts Y cooperate withthe fixed contacts;

reduction at N may then continue.

The controller has been illustratedas an automatic or machine-operateddevice, but it is to be understood the controller'refcrred to in theclaims does not necessarily involve machine-moved or automatic switchingdevices.

It is to be understood that the illustration is exemplifying only, manyvariations in ar- -rangenient beingobvious' to those skilled in the art.We have simply explained the principle of our invention and the bestmode in-wluch we at present comtemplate applying that principle.

. We claim:

1. A motor controlling system comprising a motor field, an armature,supply connections for furnishing current to the field and armature, ashort circuit across the armature,

a normally open switch in said short circuit, means for operating saidswitch at or before reversal of armature current, a pair of rheo- 10ostats in parallel in .the field supply connections, and a controlleradapted to reverse the direction of current in the armature and toalternatively bring one or both of said rheostats into action, combinedsubstantially as set forth.

2. A motor controlling system comprising \switch Q; solenoid R isdeenergized an open switch J magnet K is strong but losing strength;magnetKis acting through shorter a motor field, an armature, sup lyconnecair gap than magnet M; switch 3 remains trons for furnishingcurrent to t e field and closed till magnet K weakensand magnet Mstrengthens sufficiently to open the switch; main current is now inreverse direction through armature;' armature short circuit is open;field is energized by current through both rhcostats F and G inparallel; current through field is thereby increased; armature armature,a controller for reversing the direction of current in the armature, ashort circuit across the armature, a normally open switch in said shortcircuit, means for closing said switch prior to and during reversal, arheostat in the annature-supply circuit, 1L5 means for automaticallyputting said rheo stat to maximum resistance, an electromagnetic devicecontrollin said rheostat, a normally closed adjustab e switchcontrolling said electromagnetic device, and an elect-romagnetic devicein the armature sup ly circuit cooperating with said switch'an tending'to open-it, combined substantially as set forth.

speed. The circuits for forward runnin are as follows: The field ispartly supplied rom the positive main through resistance F and partlythrough the positive main throu h fixed contact segiiient Y, contact andresistance G. The main armature circuit may be traced through'the line Tin a I reverse direction to the course described for 3. The combination.of a field, means for backward running. The shunt circuit? is supplyingthe field through a single controlbefore described. ling device for onedirection of rotation of the Fourth: Attire end of the slow cuttingmotor and through two controlling devices stroke a reversal is affectedas before, the arfor the other direction of rotation, a main armaturesnort circuit being closed prior to and. mature circuit including amagnet, and an magnets and arranged to aguars-s armature short circuitincludin a magnet and a single switch controlled iv the two. open andclose the armature short circuit.

4. The combination of a closed field circuit, an= armature circuitincluding an electro-magnet; a solenoid and a rheostat, an armatureshort-circuit including 'an electromagnet, a switch controlled by thetvifp-electro-Inagnets and arranged'to 0 en and close the armatureshort-circuit an a shunt circuit including a switch arranged to(:Fen'and close the shunt circuit and actuate by the solenoid of thearmature circuit and a shunt solenoid arranged to actuate the rheostat.

5, The com ination of a closed field circuit, an armature circuitincluding anelec- V armature short circuit, an

tro-Inagnet, a solenoid and a rheostat, means for reversing the armaturecircuit, an arma ture short circuit including an electro-magnet, aswitch controlled by the two electromagnets and arranged to ogen andclose the including a switch arranged to o the shunt circuit andactuated y the solen- 01d of the armature circuit and a a shunt. circuiten and close shunt solenoid in the shunt circuit arranged to actuate therheostat.

6. The combination of a closed field circuit including a regulatingdevice, a second field re ul'ating device, a main armature circuitingluding an electro-magnet, a solenoid and a rheostat, a controller forreversing the;

field circuit, said controller'having'means for placing said secondregulating device in the armature circuit in onedirection ofo era- 'tionand for cutting it out in the other irec- Y the solenoid of the armaturecircuit, and a ,solenoid in the shunt circuit arranged to 210- tuate therheostat. I

ARTHUR r HOGREBE VICTOR 0. 1772* Witnesses: A f

H O. ALLEN,

WM. H. Km xarn.

